Hi,
I have a macbook pro and some Seagate and Western Digital external 2.5 USB3 HDD.
In mavericks, everything worked fine.
I have just installed Yosemite, and my USB3 HDD won't appear in the finder.
Any one knows the problem ?
Sincerely.
Mister N.
MacBook Pro, OS X Yosemite (10.10)
Hello there, mister_n.
It sounds like your external USB hard drives are not being recognized after updating to Yosemite. The following Knowledge Base article offers some great recommendations to follow for troubleshooting that issue:
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.
For my hard drive that doesn't show up at all, the problem is not Yosemite per se. It's the USB3 driver incompatibility. Try using a USB2 cable (micro USB just like an android charger cable that plugs in half of the slot on your hard drive) and it will work. Or try connecting it to an older computer that has USB2 ports on it (with the original USB3 cable) and it will work BOTH on Yosemite and Mavericks. Of course it will transfer data at USB2 speeds. Apple screwed up the drivers again so we have to wait for them to 1. receive thousands of complaints 2. wait for eternity to acknowledge there's an issue. 3. take their sweet time fixing the USB3 drivers. Until then you can get by with USB2 cables. I hope this helps!
USB 3 drive does not appear in finder (nor mount?) since Yosemite
